Spark plug



June 21 1938. M s s SPARK PLUG Filed Sept. 25, 1936 a a R m i H m s n T1 u m W m m k s. 7...| 3...;1. AMM\ I a 7 M v /H\ l u u Patented June21, 1938 PATENT OFFlCE 'SPARK PLUG Manuel Sousa, West Hartford, Conn.Application September 23, 1936, seam No. 102,110

3 Claims.

' among others, is the production of a spark plug which is simple inconstruction and particularly efllcient in operation.

One form of a spark plug, embodying my invention and in the constructionand use of which the objects herein set out, as well as others, may beattained is illustrated in the accompanying drawing in which Figure 1 isa view in side elevation of my improved spark plug which is partiallybroken away in central lengthwise section.

Figure 2 is a similar view looking in a direction at right angles fromthe point of view of Fig. 1, the section being slightly oil from thecenter.

Figure 3 is a view in central lengthwise section through a modified formof my improved plug.

Figure 4 is an end view of my improved plug.

Figure 5 is a view similar to Fig. 1 but showing another modification.

Figure 6 is a view in side elevation of the plug shown in Fig. 5 withthe parts disconnected.

Figure 7 is a view in central lengthwise section of last mentioned plugbut looking in a direction at right angles to the point of view of Fig.5.

Figure 8 is a side view showing a little different form of my improvedplug.

In the accompanying drawing the numeral 8 denotes the body of myimproved spark plug that may be composed of any suitable material havinga threaded portion 9 as a means for attachment to an engine, said bodyalso having an angularly shaped portion III for the reception of awrench by means of which the body may be aflixed to or removed from anengine. The body has a central opening ll extending through it for thereception of a core l2 composed of porcelain or other similar material,the parts thus far described being of old and well-known construction.

The core has a central opening through which a conductor l3, preferablyof nichrome, extends, the outer end of said conductor being threaded toreceive a terminal l4 composed of any suitable electrical conductingmaterial. This terminal is embedded in a cap l5 of insulating material,such as bakelite, or other suitable composition, the terminal beingpreferably molded into place in the cap. Said terminal has a socket l6for the reception of a conducting wire ll suitably insulated andprovided with a metallic cap l8 formed to fit the socket [6, said caphaving a rib l9 to frictionally engage an annular groove in the wall 01'the socket l6, and as shown in Fig. 1 of the drawing. An electrode 20 ofstar shape is secured to the end of the tip 30, the fingers 2| of saidelectrode extending into proximity to a ring-like electrode 22,preferably composed of nichrome, secured to the end of the body '8, andas shown 5 in Figs. 3 and 4 of the drawing, the electrode 20 also beingpreferably composed of nichrome.

A tip 30 of suitable heat resisting material is secured to the end ofthe conductor I3, and as shown in dotted lines in Fig. 3 of the drawing,10 as a preferred means this tip having a threaded socket to receive thethreaded end of the conductor; The core l2 may if desired be providedwith a jacket 3| composed of asbestos or other suitable heat resistingmaterial and as shown in 16 Figs. 3 and 7 of the drawing. A nut 32 alsoof nichrome may be employed for attaching the conductor l3 to the core|2.

The operation of the plug will be readily understood by those skilled inthe art, it being 20 briefly stated that the electric current passes bywire ll, terminal l4, conductor l3, electrode 20, and across the gapbetween the ends of the fingers 2| and electrode 22, thereby creating aspark. From this point the current passes through the body of the plugwhich is grounded upon the engine in a manner common to structures ofthis kind.

That form of the device shown in Fig. 3 is similar to that shown inFigs. 1 and 2 except that the 80 terminal 23 extends lengthwise of thecap 24, opening toward the end of' said cap. This 10-- cates the socket25 for the reception of the wire I! at the end of the cap instead of atthe side, as shown in Fig. 1.

The caps l5 and 24 may be screw threadedly engaged with the body 8, asshown in Fig. 8, or

they may be held in place asby means of a ball 26 as shown in Figs. 5 to7, the bail being pivotally attached to the body 8 and being adapted tobe sprunginto a notch 21 in the top of the cap. The structure shown inFigs. 5 to 7 is similar to that shown in Figs. 1, 2 and 3 with theexception that the electrodes 28-29 are of a type common to spark plugconstruction.

In accordance with the provisions of the patent statutes I havedescribed the principles of operation of my invention, together with thedevice which I now consider to represent the best embodiment thereof;but I desire to have it understood that the device shown is onlyillustrative and that the invention may be carried out by other meansand applied to uses other than those above set out.

I claim:

i. A spark plug including a body, a core extending within said body, aconductor extending within said core, a cap of insulating material andhaving a skirt with its lower edge attached to said body and having arecess, a terminal permanently enclosed in said recess in said cap,means for securing said terminal to said conductor, a socket in saidterminal to receive a conducting wire encased in a sheath, a cap on theend of said sheath to frictionally engage said socket, and cooperatingelectrodes at the ends of said conductor and body. body.

2. A spark plug including a body, a core extending within said body, aconductor extending within said core and having a threaded end, a

tip of heat resisting material secured by means of a threaded sockettherein engaged with said threaded end of said conductor, a cap ofinsulating material attached to said body having a skirt with its loweredge attached to said body and having a recess, a terminal permanentlyenclosed in said recess, means for attachment of a conducting wire tosaid cap, and cooperating elec trodes at the ends of said tip and saidbody.

3. A spark plug including a body, a core extending within said body, aconductor extending within said core, a cap of insulating materialhaving a skirt with its lower edge fitted to the end of said body, abail pivotally mounted for removably securing said cap in place byengagement therewith, a terminal permanently enclosed in a recess insaid cap and secured to said conductor, a socket in said terminal toreceive a conducting wire, and cooperating electrodes at the ends ofsaid conductor and body.

MANUEL SCUBA.

